Due to the trend towards taller but lighter vehicles, crosswind sensitivity gains in importance. However, the complete system Aerodynamics – Vehicle Dynamics – Driver is insufficiently understood. The aim of this thesis is to provide an understanding of the unsteady aerodynamic behavior during gusty crosswind. Using numerical simulation significant unsteady effects in side force, roll and yaw moment are identified. The underlying unsteady flow mechanism is derived and its main characteristics are verified experimentally. Furthermore, the validity of the unsteady mechanism is shown for the vehicle types fastback and station wagon. Finally, the influence of selected gust parameters and geometric changes is investigated.
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Due to the trend towards taller but lighter vehicles, crosswind sensitivity gains in importance. However, the complete system Aerodynamics – Vehicle Dynamics – Driver is insufficiently understood. The aim of this thesis is to provide an understanding of the unsteady aerodynamic behavior during gusty crosswind. Using numerical simulation significant unsteady effects in side force, roll and yaw moment are identified. The underlying unsteady flow mechanism is derived and its main characteristics ar...
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